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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Earnings [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2018 $ 353,092 $ 27 $ 262,250   $ 166,071 $ (75,256)
Beginning Balance, Shares at Sep. 30, 2018   27,141,267        
Net income 4,910       4,910  
Purchase of treasury stock (229)         (229)
Shares issued pursuant to employee stock purchase plan 507   507      
Shares issued pursuant to employee stock purchase plan, Shares   30,650        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   35,000        
Shares issued upon exercise of stock options 1,311   1,311      
Shares issued upon exercise of stock options, Shares   108,275        
Stock-based compensation 1,448   1,448      
Stock-based compensation, Shares   2,135        
Cumulative effect of change in accounting principle - net after tax | Accounting Standards Update 2014-09 [Member] 399       399  
Ending Balance at Dec. 31, 2018 361,438 $ 27 265,516   171,380 (75,485)
Ending Balance, Shares at Dec. 31, 2018   27,317,327        
Beginning Balance at Sep. 30, 2019 $ 368,819 $ 28 269,969 $ (669) 202,455 (102,964)
Beginning Balance, Shares at Sep. 30, 2019 27,508,473 27,508,473        
Net income $ 9,059       9,059  
Shares issued pursuant to employee stock purchase plan 505   505      
Shares issued pursuant to employee stock purchase plan, Shares   38,352        
Shares issued upon vesting of equity awards, net of minimum tax withholding (476)   (476)      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   123,993        
Shares issued upon exercise of stock options 111   111      
Shares issued upon exercise of stock options, Shares   13,000        
Stock-based compensation 1,513   1,513      
Stock-based compensation, Shares   2,946        
Foreign currency translation adjustments, net of tax 606     606    
Cumulative effect of change in accounting principle - net after tax | Accounting Standards Update 2016-02 [Member] 610       610  
Ending Balance at Dec. 31, 2019 $ 380,747 $ 28 $ 271,622 $ (63) $ 212,124 $ (102,964)
Ending Balance, Shares at Dec. 31, 2019 27,686,764 27,686,764